so awhile ago i asked what i should do to get better mileage with my '64 gmc p/u with a 350 & holley 4160. The overall opinion was that I should get a Quadrajet because its got modest primaries and larger secondaries.

so, if that means the size of the jets, then can't I just switch out the jets on my holley to smaller ones? Or is that not going to save me mpg's in the long run?